| 摘要 |
PURPOSE:To detect the value of fluctuation in pulse intervals only by the operation of reversible counters by setting initially a desired deviation value of the pulse interval in advance for a pulse interval decision system equipped with two reversible counters. CONSTITUTION:The initial deviation value alpha of the pulse interval is inputted to the reversible counters 6 and 7 through a circuit 8. The counted value of the reversible counter 6 increases continuously on the basis of a value alpha as a basic point until a next input arrives at an input terminal 20 and the counted value of the reversible counter 7 decreases continuously on the basis of the value alpha as a basic point; when it enters an underflow state, a pulse from a C/B is inputted as a clock to a D-type FF4. Consequently, the output Q' of the D-type FF4 falls and is inputted to the up/down switching terminal U/D of the reversible counter 7, which then counts up. The counters 6 and 7 both count down by a next input to the input terminal 20, but when there is another signal appearing at the terminal 20 before the counter 7 enters the underflow state firstly and then the counter 6 enters the underflow state, it is found that the pulse intervals are within the range of the deviation value. |
